#include<stdio.h>

void foo(int [][3]);
void main(void)
{
    int a [3][3]= { { 1,2,3}, {4,5,6}, {7,8,9} };
    foo(a);
    printf("%d", a[2][1]);
}
void foo(int b[][3])
{
   ++ b;
   b[1][1] = 9;
}